Crazing
Small hairline cracks in glazed surfaces that usually appear after firing but can appear years later. It is caused by a mismatch in the thermal expansions of glaze and body. A glaze of higher expansion shrinks more than the clay to which it is attached and therefore crazes.
There are many treat-the-symptoms approaches to crazing but the bottom line is: If there is a thermal mismatch it will reveal itself sooner or later no matter how you adjust firing or glaze thickness to hide the problem. If crazing is visible, it is an indication of a significant problem. This is because long before crazing becomes visible, serious strength problems result where glaze and clay are not expansion-compatible. In addition, crazing also call into question the functional safety of ware (e.g. bacterial hazards). Out Bound Links
In Bound Links
Pictures
Crazing in cone 10 reduction celadon glazes is common because they are high in K2O/Na2O
Example of crazing in a glaze
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